Today we are going to go back in time, we will go to the origin of complex life, until 520 million years ago when the first groups of animals (arthropods, mammals and molluscs) appeared on Earth.
In ancient seas, in the emergence of complex life (Cambrian Explosion) we find a rare animal, a creature that looks like a sketch of the creation ... as if evolution had thought - I'm going to put this together with this, to see what happens.
This prehistoric animal that seems from another planet, called Diania cactiformis, cactiformis means in the form of cactus, so its common name: The walking cactus.
The truth is that there is no plant. The experts believe that this curious animal occupies a far evolutionary empty, It is between worms and arthropods. With the discovery of this animal is evidence that the big group of arthropods evolved from worms. Among arthropods and worms, is walking cactus. Among the prehistoric arthropods more "famous" can find the Arthopleura, the Hurdia Victoria, the Anomalocaris or pulmonoscopius ... and now, the walking cactus, which is the oldest arthropod found yet.

The Diania cactiformis was small, measuring about 6 cm long and had a long, thin body, vermiform (worm-shaped elongated). His body was segmented with hard covering (exoskeleton), and body of arthropod born 10 pairs of spiny legs hard, sharp and thorny (hence the name of cactus). And you do not think it was like a starfish elongated, no. The walking cactus had jointed legs, was fast, and even experts think that could jump with some agility: he was a ruthless predator ... maybe I exaggerated when using the word "ruthless".

Anyway, walking cactus, it was a prehistoric ocean that lived 520 million years. It lived on the seabed of what is now the province of Yunnan in the Himalayas. Its marine fossils found in the higher mountain formation of the Earth. Another curious fact of which I speak.